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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f860667aa7b2cdf48bc13e82bd1bd2c20ab8ede4794c0174c5c54ece2a987b4e' 
  AND token = 'a8SOoR/ZQj+J4/BQamRIk8VcjZeEMlS+sY7dOJzjAo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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