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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'becfee553a4ac0b082dc78811b974d283fffa27bfe5be14399ca8615cf719428' 
  AND token = 'rwnE+pcilXa6IBW83Ud0n2tX/N75s/KV5LNBPtBF0Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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