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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee6d2f59c0655eded10607b8e08ce442265ed1b92d4d35ca75a82d812ef16e05' 
  AND token = '+5Le8J9JEn2E9QSFILgP2dX75xe93OuWP3y62/f3fcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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