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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fc4a104f6b78e86b6e0d61f6cb17a19ebd7fa54afc2a4e31d2b8fdd0e1c3ef' 
  AND token = 'mnAFe6Uy8eNzKKNb5OMh1ew9Vh5Avysne4T7PKqEyGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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