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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '098a0c90d2828291579af69cc5dc3e55e145502b43eb318fc75e7837f293c753' 
  AND token = 'mjr5RmFw8dbPxgKVhOMeApEyet1EHefy1gQVFWylhOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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