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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '297a53b971911c4957af46c3334c9cb9161b4023155e44ae215ccd7651659eaa' 
  AND token = '6bX+0onQuQZdk+3xKF1oriY3GlNm/vt1c6Pgu3oGL+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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