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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5e5548fe652701ea9492201b8c765bd4a6008ac4a9799a14270313bf6c3b9b4' 
  AND token = 'UyiBflrNB2tk75EUn3cgOleqxCChfF7LR7CDzbXY4Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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