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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da84765f8b9b9c0941b799610669f7a1d3f31c9ebeff6b80c566c50307406f9b' 
  AND token = 'g5bdHWmRCc+vEuFQrzmkBu931dOmcBOv21O8eBjUh5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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