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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87dd6493606d1d30bdd8dc6b061de3e3ae17f554214c60f5b146fcebac17d0a2' 
  AND token = 'WZoZDn9vZasUyszkidzw3T9r3x03sJ+heYvWX2XK9Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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