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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75b677b3c425c05a21b4bd2aba8e9e35856e4b6d02b10f5d2156f0ea9bfa15be' 
  AND token = 'CRecQTDDDz4j84XgS3fhV464ts4BCpDa+Bywp0g84fA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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