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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb7ec6e731b6d0b06cbb8d03ad83635fef59f86af644b709ebc80de3f541b61d' 
  AND token = 'yspRQLpgbFlqmshXBivqazlTr5rPEMy/ZzIy5JJVSgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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