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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '976fa9cce40e97c85e4fcf8586d59ceb821fb721bbbab84a9eff84130fd1f487' 
  AND token = 'otvGEqH8daUPizX/YeoDi7QW9Ia1i32W0GUaJ6X5PE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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