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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '770aabdb88aaa70a1d5df8d023d1040fa5ae127945be51e6c867ac0dcd44fc42' 
  AND token = 'HVf8EKfRf8uL2iROHhKNsYwqPl+59kAw7nCtEjm5VTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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