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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d70cdf18c840d26542a282c3c8a2b4d6a601f9d8f1af2f95e07da80f12a7187' 
  AND token = '77QcaNFnlxY1kEuxu9qZ4wEUp8TwxiQ++R1j9BJyri0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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