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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6143c7e03e7a1cbda96b6c27eb5619ee586a650d5a37dde85be140fc51b6b06' 
  AND token = 'pOVScJONrr1jkCQuvoB8ONpHoFmTxh/22P7lhGHKBs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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