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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '619c241b4b2855dd57b9d5cc948fc7fe5d177eed55d562c52e2f7d6b7cd6dc87' 
  AND token = 'oY5UL1Mb53Pb3W5dEsFs8dfkoombKZ9LtdfO6UY+qms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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