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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a2ded0119384254049c69f80ee9d13cbb5afe067245639065427f48dd139ad0' 
  AND token = 'Urhxng0slzh0lKWBIgDjm4u8d8U2mNv0v0ePWxloIZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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