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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '409b51f45552bf37ae4245a992723403682569a14cd0d1ff65b7a5e6e1c174aa' 
  AND token = 'feiwdB+ojw9LM5EGpWeHnqPaBF0BywqYCJfF6xvcah0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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