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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db237d85b51b9079571158e9af4c5ee4505da79ddf8fa1cee4fe7da1ebcea41b' 
  AND token = 'Bex8Sh/BXYNXHyY3RSyNoVOjG2cdj40Vrc9pvz5vBbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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