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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '012e7525ccab37d110419cb640395f743473607e0e2905a63f3ec59705c04803' 
  AND token = '02a+L0TBj7w3XmjLv/MgmyrpD6zZG2fqveshVGcazg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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