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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbff01fe8bf51f1fcdd9c6e53ba03daffa42fb7f60573a0af10ed2acf33fac5a' 
  AND token = '0xHxQcjc8ovqMcyydK8Lr0x0k+e6mYtqwchqr63TGUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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