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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f059b5c5d069850e490f2973a4fdc231bb58d24ec56e1f1fcf3768756dc8be32' 
  AND token = '7wkiyVlQxkKEoP2WrB3IKrraoI0L464WSUn1yAQ+ZX0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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