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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecb1009249584695ccdee7e0a582d75d05d03259c13dda848e1a0355b263c9dd' 
  AND token = 'QFlAbVF2DT2twg4BYZJEyWOiAPbS0rJeaxQyJ04zDoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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