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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60ea32ec69673d40f31212aa8a68bae352c410463979bbcbf174a4a9b6a128d5' 
  AND token = '+KU9sLwc7mG+g1MOPBlW9yXEQD+fkoNvP2bdGAKj8II=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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