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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08f2dbc76a6f78fed5b1fc016081f26a617aedba75838d839c491c9790acdbe9' 
  AND token = 'yNPLwSlCU0ppJ4xIm4O4aLzIN8vNBvpqr1F2rzWBPqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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