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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45ff4d6bb476f615dc676d1c97be5945c548a64d0f0612514cf4f1eade514028' 
  AND token = 'PhX4R/E484BjyG6SS2NCX2Sa8lu2jenfsR6zT15AVV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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