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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b39f470c704050f18637c69a259f31c80e8e3726a419d3a54079f3e90ecd7d' 
  AND token = '/0PLemssmz59Axpse4/vxu6MxE6HlKkGpXKStnvEJ14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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