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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd826f43f6bb4bb3ec88157cab4adae5aefdc3ce6b2bbe8fa61d2b299bfe40b9' 
  AND token = '8DDNcLvhK4i/ljaba8qj1ccz5BPEDLZuiUM586cdOf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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