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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6117d61915bd73fdfdb6733cb727c52bd711535d1851c65daf77aa6b016e133c' 
  AND token = 'j//jDgjJMc0u4ArRdKmHnlixuf4U1qcA5Dy3uEl6lVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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