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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c3470045ed34a07dab01fde80fe08e0aff4e22f6526c634a723bdedcbf51f4' 
  AND token = '24OmwYMEbWbkJXA1bsPMRek2FCfV5I8AyBFBfFQ2p/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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