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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e986fad85b49f473d2880705a682dc7ff4ea796ae50bfc59c6ba1f830498821c' 
  AND token = 'OM2QiCMvAmOlak+63R6cOorCSnF/E7VuZl+8TJlF2fI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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