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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef512fed591450a529213728c0e9aa371d91bcdc68f9994b5a4b0bc91c082421' 
  AND token = '/UbA9OTY+/54BviFUsy4Gl9+gprecItxNun9MTFeQxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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