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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '239e56bb1e60bb5aa5d06804c83241d38c471869ee7d621ac69be846db2cab5f' 
  AND token = 'DNpuxVpqDI3wH4ReFQEU8svq5V7mS400JmxtV7EsiaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00095

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}