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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd863eab20350fe4a4888c4966c0c335805237c65434c9c564893cf0ae65b9a' 
  AND token = 'bH4k3KEMAxsGaPQYMCFOV/LMwsQxK9vB8HGi6F0WCsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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