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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee57e86694399ae9c2c9dc684f9a936abd8bd9a6df1aa1516377baaef02c9d28' 
  AND token = '8IPDKvmO6tZiLfQj6yXhbcxZPitv7qH6QO2eBE2YHjQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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