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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eae6d972448536e6599d4e91ce62665467e49d28f447122b5d9331f33045f66a' 
  AND token = 'Hjug8UbNEujV4RKFxh17CQBoUX93LtXvFDfXp3tSrnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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