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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e814a952fa1ba392c3071c4888a27d3c926605a633322b03829cd866c05f1b5' 
  AND token = 'HJsf46MKAXJ7eH76ay31pwrCRsaTbrjB0lHqqoT3TQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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