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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '808a8eda0e8d85a70b67eeb30b548486830512b8bd269c165569f84bcaa88b70' 
  AND token = 'GKaO231R42C7cx5FOz2lenkvsAfjGA4YxUntJu1KgPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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