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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9046aebdafc21b18f0ccfd65b69e2202044efa6af1eeb60a9a46c879af231b14' 
  AND token = 'DJuNS1s/pl+dcAc8CWPs7zyRG17J4Rj6SBphk+NLOyA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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