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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6e7fe70e0bf581c68155be5384aa352004501fd7e4943002d7b8551bf76c857' 
  AND token = '/FIIBxP7xBLakWVtFf3ErSK6hKLG98llgAY2ieRC1jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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