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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca037a241bb3b033e1a0afba5a040b3ec0cc6a5e26e0e659f207d09ca83233f2' 
  AND token = 'UxUfvTQgiH5pqMuHd90VoRkvF1cRnJNAer6ImOEaH18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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