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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b73b6e6c04a600a91c88bfb7351507589fe92ebdc2ea78349de1d047d0f333ce' 
  AND token = 'BpTENG14j2++ayQI1IsgQQ7txIT0KF8S+uEsYR+wx3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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