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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f11cc8173a9d4f740647840829b8e9ed17f8840f3c39c41a3d0a509b8ccef831' 
  AND token = 'OUgRcfdsWqHdqk0zqfd/UslSy32zvW27FhDFLszwDJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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