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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0b13b4ab2e9d12ada122ba5e94ad10c048e8dd042889f6c053d255ce30e6e6' 
  AND token = 'ZWgC7GRie8YhpGlAXUhckT5JcdCRBjeJ7la7KcrLM1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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