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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1cf607d57b03451b0371c6a18e963defd41c81e5790fad60d17a9b7349edda4' 
  AND token = 'QmzPHxPS70DGc2qOUK/njw4Ro1orurEmC+IKkMTq0z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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