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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90b71aa0996f3ace1e6b0ff06a9d8a7299b51c9997a4d353dc3dee05df39c1b5' 
  AND token = 's8rMqUmJW8q/7WnUWcNTFEGkiROfzkUIY2ZPPMK/QWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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