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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0409629729ab0b9482f4c6558b0a578a6a943b833c95520476e1125cbe7c1ec6' 
  AND token = 'zYj80CDfQ89CoNA6ORe6FksYJYW/IXqoU8BL89sF6xE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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