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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1174add24358d353dfa8d772c22fa3815ea2a1424718a8eef4ea850c4b8616c5' 
  AND token = 'ShowNRhNv+J9eMDWjq6homcWOAAeCR9Hmy0JR8Rk5XY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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