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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'febe68a5116039d0666c8dba45452869736995f03b85a840ee58a3f527f15fcb' 
  AND token = 'SqvrQvrMx8wPcq9Iyy7Qjy0/AGW8Kh7C/p4fbgx0i3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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