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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19267aed8032f14b3ec690636e8008a8cf8916ec11c578802479c78feadd3fe' 
  AND token = 'OIXngSm1///MY+Rfl4Hqow7BourButTGQw83O9+A6JE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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