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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b394869fa13b23e8309fa0d3dc48c6bd1d0479bdc50bd9befe3f2c084640994f' 
  AND token = 'KfBCtVZ0qAr9MwqK6fdJA7Ko936iI3R1vpR/kZDsKMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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