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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928faffa8668b1925871738c1d3552d548df053b5f8d026366c532c03c329e98' 
  AND token = 'yLsZ0iyLLoCF1T4jfWrIgRjDZMnYSSL3pZXuNokGBdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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