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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92787398d1956f4a8a0bfdaf9f9bbf4a604e42aaabfa9b2c68cd6c5a1ec5b69' 
  AND token = 'iKlEKEE1AeO2uFJSuesSQD3KPnH9XOA/5LCEonbZsEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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