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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6af2e265bfb0870d3f3580ea8ccc957201dc555351459f7cc6ab7ee11849062d' 
  AND token = '/m5bq5Hn/LqYASgmUAOIunqTQr2jJgoVYo32mmEmScE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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