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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6538f687acce3db6add9e5c8015442b5961fa4dfb5805f5eb2c993f7695757fa' 
  AND token = 'ss4fvU/dEgBTQoIzm8HNZ6NO6m+YadRz6BBDxBv2P18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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